Method of preventing offset in printing



Nov. 10, 1931.

E'. C. FRANCOISE METHOD OF PREVENTING OFFSET IN PRINTING Filed July 29,1929 INVENTOR a? [70/760/3? Patented Nov. 10, 1 931 UNITED STATES PATENTOFFICE EDWARD c. rrmn'corsa, or 'xALAmAzoo, MICHIGAN, ASSIGNOR 'rommmzoo VEGETABLE PARCHMENT COMPANY, or IKALAMAZOO, MICHIGAN METHOD OFPREVENTING OFFSET IN PRINTING Application filed July 29, 1929. SerialNo. 382,047.

The main objects of my invention are:

First, to provide an improved method of preventing offset in printingwhich may be economically practiced with simple and compact apparatus.

Second, to provide an improved method of preventing ofisetting inprinting which is eflicient and greatly increases production.

Objects pertaining to details and economies of my improvements willdefinitely appear from the detailed description to follow. The inventionis defined in the claims.

The manner of carrying out my improved method is illustrated in theaccompanying drawing in which the figure is a diagram matic view of anapparatus by means of which my improved method of preventing offsettingmay be practiced. 7

Referring to the drawing, 1 represents a roll of paper to be printed, 52the web of paper and 3 a printing machine. At the rear of the printingcylinders I support a heated roller 4 so that the unprinted side of theweb contacts with this roller. is sufiicientl heated to heat the paperto a substantial egree and this heat increases the drying or settingaction of the ink.

At the rear of this heating roller I mount a chilling and moisteningroller 5 positioned so that the web of paper may be brought into contacttherewith romptly after leavin the heating roller. he roller 5 is cooledby means of a suitable refrigerant to such an extent that frost isformed on thesurface of the roller. As the web of paper passes intocontact with the rotating roller the paper is cooled and, owing to themelting of the frost, the paper is moistened.-

After leaving the roller 5 the web of paper is wound or rolled up, theroll being indicated at 6, thereby bringing the moistened side of thepaper in opposed relation to the printed side as the paper is wound up.Inasmuch as printing mks commonly employ an Oll base or vehicle themoistened surface constitutes a resistant to the ink thereby effectivelypreventing offsetting.

The apparatus is simple and may be readily installed with printingmachines as commonly employed. I have not attempted to The rollerillustrate or describe various embodiments or additions of myimprovements as it is believed that thisdisclosure will enable thoseskilled in the art to embody or adapt the same as may be desired.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. The method of preventing offsetting consisting ofprinting, passingthe printed paper over a heated roller with the unprinted s1de incontact with the roller, passing while still heated over a roller cooledby means re sulting in frost collecting on the surface of the rollerwhereby the paper is cooled and moistened, and winding into a roll whilestill moistened.

' 2. The method of preventing offsetting consisting of printing,subjecting to a heating means and while still heated passing theunprinted side of the web over an element cooled by means resulting inthe collection of.

frost on the element so that the paper is moistened by such contact, andwinding into a roll while still moistened.

3. The method of reventing offsetting consisting of printing, bringingthe unprinted side of the paper into contact with a heating element andwhile still heated bringing it into contact with an element cooled bymeans resulting in frost collecting on the surface of the elementwherebythe paper is cooled and moistened, and winding while still moistened.

4. The method of preventing ofisetting hand.

EDWARD C. FRANCOISE.

